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论述了常规光干涉甲烷检测仪井下气体分离方法存在的多种缺陷，提出了用 5A型沸石分子筛分离煤矿井下气体的新方法，并从理论和实验上得到验证。
The disadvantages of gas separation method in conventional light interference methane detector are discussed. A new method for separating gas from coal mine by 5A zeolite molecular sieve is proposed, and the theoretical and experimental verification is given.